Heatmap error :'NoneType' object is not callable when using with dataframe

Question

I have this issue with heatmap from seaborn. I don't know how, but seaborn.heatmap() refuses to take in dataframe, it instead show the mentioned error. Seaborn, matplotlib and pandas is up-to-date and I'm using python 3.10 on Visual Studio. The code is just a sample code from seaborn.heatmap itself:

import pandas as pd import seaborn as sns import matplotlib.pyplot as plt flights = sns.load_dataset("flights") flights = flights.pivot("month", "year", "passengers") ax=sns.heatmap(flights) plt.show()

@Dilettant is this what you want? I'm sorry if I'm mistaken: Stack trace: > File "D:\baitaplaptrinh\lamchoi\PythonApplication1\PythonApplication1\PythonApplication1.py", line 6, in <module> (Current frame) > ax=sns.heatmap(flights) — Dư Huy
– Dư Huy, Commented Dec 5, 2021 at 9:12
I've been running into the same issue. It looks like something is setting np.core.numeric.dtype to None. When a dtype check occurs (part of Matplotlib's plotting), the np.core.numeric.dtype() function is called. Since this has been set to None by something, it raises the error you've noted above. Still trying to figure out how this is happening. — Brandon Schabell
– Brandon Schabell, Commented Jan 11, 2022 at 23:10

rudolfovic · Accepted Answer · 2021-12-05 09:37:34Z

8

Use Python 3.9 (or 3.8, 3.7, 3.6) as it seems like both pandas and plt are not quite ready to be used with Python 3.10:

edited Dec 5, 2021 at 9:37

answered Dec 5, 2021 at 8:44

rudolfovic

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2 Comments

Dư Huy Over a year ago

I dont know if this is the right one, but in the output, it said:Stack trace: > File "D:\baitaplaptrinh\lamchoi\PythonApplication1\PythonApplication1\PythonApplication1.py", line 6, in <module> (Current frame) > ax=sns.heatmap(flights)

Dư Huy Over a year ago

I'd love to, but my reputation is too low, sorry

Shriram Raveendran · Accepted Answer · 2025-03-09 22:38:23Z

I eventually solved that issue by calling the heatmap module separately: 'from seaborn import heatmap'. That had to be done even after already explicitly stating 'from seaborn import *'. Smh.

But, on the plus side, no need to downgrade to 3.9 after all.

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